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File:Blastcurves psi.svg

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Original file(SVG file, nominally 600 × 400 pixels, file size: 75 KB)

Summary

Description
English: Overpressure ranges from 1 to 50 psi (6.9 to 345 kPa) of a 1 kiloton air burst as a function of burst height. The thin grey curve indicates the approximate optimum burst height for a given ground range.
Deutsch: Abhängigkeit des Druckpegels einer 1-Kilotonnen-Explosion von Entfernung und Detonationshöhe. Die dünne graue Kurve gibt näherungsweise die optimale Detonationshöhe an.
Date Created: 21 November 2008
Source Own work
Author SiriusB
Other versions

Image:Blastcurves_1.png

Additional Info

Plotted with Gnuplot 4.2.2. Isobars are based on numerically solved formulae from the internal help pages of the BLAST software, the H_opt curve is an analytical fit using the inversely plotted formula

This function should fit both BLAST output and Figures 3.73a-c taken from Glasstone, Dolan, The Effects of Nuclear Weapons, 1977 (EoNW77) as a compromise. Both sources differ slightly. EoNW77 shows the maximum low-pressure ranges at somewhat lower altitudes whereas for high pressures >40 psi BLAST shows no optimum altitudes at all (see the innermost isobar). However, since numerical fitting of curves taken from a paper would be a Sisyphean task while BLAST already outputs plottable numbers, only isobars from the latter are plotted here.

Why psi?

Most sources, e.g. Glasstone & Dolan (1977) or Carey Sublette's Nuclear Weapon Archive use pounds per square inch as pressure units. As a rule of the thumb, e.g. most non-reinforced buildings are destroyed for overpressures above 5 psi. However, the pressures can easily be converted into SI units, e.g. kilopascals, where 1 psi = 6.8947573 kPa or, roughly, one psi equals seven kPa.

Additional notes

A note on Gnuplot SVG terminal: Set size variable as "fixed" (the default in Gnuplot), not "dynamic", to ensure correct aspect ratio. This was the reason for uploading a 2nd version.

Licensing

Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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Date/TimeThumbnailDimensionsUserComment
current10:46, 21 November 2008Thumbnail for version as of 10:46, 21 November 2008600 × 400 (75 KB)SiriusB{{Information |Description= |Source= |Date= |Author= |Permission= |other_versions= }}
10:40, 21 November 2008Thumbnail for version as of 10:40, 21 November 2008512 × 341 (75 KB)SiriusB{{Information |Description={{en|1=Overpressure ranges from 1 to 50 psi (6.9 to 345 kPa) of a 1 kiloton air burst as a function of burst height. The thin grey curve indicates the approximate optimum burst height for a given ground range.}} {{de|1=Abhängig
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